Submitted by stedevil
This could be usefull for many things, but is especially interesting for weapon ammo and it's balancing.  100 7,62 ammo is bigger & heavier than 100 .22 ammo.

The ammo should also be bought in stack size quantities in the shops, 1 click = 1 "pack/stack". 
The items file already has added "Items collected together max=12" variable 

Posted by skangas
Currently, it is not possible to do manual grouping of stacks by droping them on top of one another. This is fine, since our stack sizes are infinitely large. Though, if this RFE is implemented, that issue will probably warrant a closer look.

Here is a link to the old bug report, which has been correctly closed as being Out of date.

https://sourceforge.net/tracker/index.php?func=detail&aid=2989012&group_id=54521&atid=474019

Stefan Kangas